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Defects and Diffusion

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Mixed Conducting Ceramic Membranes

Part of the book series: Green Chemistry and Sustainable Technology ((GCST))

Abstract

Point defects are the main defect type concerned in the field of MIEC membranes, because they are closely related to the motion of oxygen vacancies and holes in crystalline solids. In the first part of this chapter, the concept of point defects is introduced briefly, and then, the knowledge about point defects in MIEC oxides, defect association, and defect equilibrium are introduced. Grain boundary is mentioned as an important two-dimensional defect because of its potential influences on the mechanical, electric, magnetic, catalytic, and thermal properties of materials. In the second part, the concept of diffusion, the diffusion mechanism, and diffusion paths of oxygen ions in perovskite- and fluorite-type ionic conductors are presented. There are several types of diffusion coefficients derived from different measuring methods, and the difference and relationships between these diffusion coefficients are provided.

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Authors and Affiliations

  1. Dalian Institute of Chemical Physics, Dalian, China

    Xuefeng Zhu & Weishen Yang

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  1. Xuefeng Zhu
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  2. Weishen Yang
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Zhu, X., Yang, W. (2017). Defects and Diffusion. In: Mixed Conducting Ceramic Membranes. Green Chemistry and Sustainable Technology. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-53534-9_2

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